Wait and both kinds of until loops; blocks run directly

Script runs are resumable threads saved with the game; Rhai is gone.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

lang/en.lang

@@ -1332,3 +1332,10 @@ demo.m2.title = Rolled Anew
 demo.m2.story = This map is rolled anew for every run of the campaign. Defeat every hero.
 demo.m2.start = A random map. Even I have never seen it before.
 demo.m2.wave = Two minutes are over: the heroes come.
+blk.until = Repeat until
+blk.dountil = Repeat, then check: until
+blk.wait = Wait
+blk.w_seconds = seconds
+blk.help.until = Runs the blocks inside again and again until the condition holds - checked before each run, so if it already holds the inside does not run at all.
+blk.help.dountil = Runs the blocks inside, then checks the condition and repeats until it holds - the inside always runs at least once.
+blk.help.wait = Pauses this script for some seconds, then it goes on with the next block (also inside loops).